Faunt, Claudia C.2012Locations of hydraulic-head observations (HOBS) for the Central Valley Hydrologic Model (CVHM)vector digital dataReston, VirginiaU.S. Geological Surveyhttp://water.usgs.gov/lookup/getspatial?pp1766_hobsFaunt, Claudia C. (editor)2009Groundwater Availability of the Central Valley Aquifer, CaliforniaProfessional Paper1766Reston, VirginiaU.S. Geological Survey3 chapters, 1 appendixOnline_Linkage: http://pubs.usgs.gov/pp/1766/PP_1766.pdfThis digital dataset defines the well locations for hydraulic-head observations used in the calibration of the transient hydrologic model of the Central Valley flow system. The Central Valley encompasses an approximate 50,000 square-kilometer region of California. The complex hydrologic system of the Central Valley is simulated using the USGSs numerical modeling code MODFLOW-FMP (Schmid and others, 2006). This application is referred to here as the Central Valley Hydrologic Model (CVHM) (Faunt, 2009). Utilizing MODFLOW-FMP, the CVHM simulates groundwater and surface-water flow, irrigated agriculture, land subsidence, and other key processes in the Central Valley on a monthly basis from 1961-2003. The USGS and DWR maintain databases of key wells in the Central Valley that are web-accessible (http://waterdata.usgs.gov and http://www.water.ca.gov/waterdatalibrary/, respectively). These data were combined to form a database of available water levels throughout the Central Valley from 1961 to 2003. More than 850,000 water-level altitude measurements from more than 21,400 wells have been compiled by the USGS or DWR and have been entered into their respective databases. However, only a small proportion of these wells have both sufficient construction information to determine the well-perforation interval and water-level measurements for the simulation period. For model calibration, water-level altitude data were needed that were (1) distributed spatially (both geographically and vertically) throughout the Central Valley, from the valley trough to the foothills; (2) distributed temporally throughout the simulation period (1961-2003); and (3) available during both wet and dry climatic regimes. From the available wells records, a subset of comparison wells was selected on the basis of perforation depths, completeness of record, climatic intervals, and locations throughout the Central Valley. Water-level altitude observations (19,725) for 206 comparison wells were used as calibration targets during parameter estimation. The CVHM is the most recent regional-scale model of the Central Valley developed by the U.S. Geological Survey (USGS).The CVHM was developed as part of the USGS Groundwater Resources Program (see "Foreword", Chapter A, page iii, for details).The well locations, perforated intervals, and time series of water levels are used as input to MODFLOW-FMP, the USGS 3-dimensional finite-difference code used to simulate flow in the CVHM. In particular, the water-levels are used as observations to calibrate the model. The CVHM is a tool that accounts for integrated, variable water supply and demand, and simulates surface-water and groundwater-flow across the entire Central Valley system.The hydraulic-head observation dataset is one of many layers in a geospatial database supporting the USGS Central Valley Groundwater Availability Project. Regional groundwater availability studies quantify current groundwater resources, evaluate how those resources have changed through time, and provide tools that decision makers can use to predict system responses to future development and climate variability and change. To provide information to stakeholders addressing these issues, the USGS made a detailed assessment of groundwater availability of the Central Valley aquifer system, which includes: (1) the present status of groundwater resources; (2) characterization of how these resources have changed over time; and (3) tools to assess system responses to stresses from future human uses and climate variability and change. This effort builds on previous investigations, such as the USGS Central Valley Regional Aquifer System and Analysis (CV-RASA) project and several other groundwater studies in the Valley completed by Federal, State and local agencies at various scales. Data from these previous studies were the foundation of the Central Valley geospatial database. These and other data were re-examined through a series of regional-scale hydrologic investigations to provide updated and spatially consistent interpretations for the Central Valley Groundwater Availability study. In some cases, new data were collected to augment existing information. Data compiled from the studies include geology (in particular, borehole lithology and the extent and thickness of the Corcoran Clay Member of the Tulare Formation), topography, remote sensing, climate (precipitation and temperature), geophysics, vegetation and land use, vegetation properties, hydrology (stream network and flows), groundwater levels, subsidence, chemistry, and soils. Digital elevation models, geologic maps, borehole information, cross sections, and other 3-dimensional models were used to develop the texture model which represents the properties and geometry of the Central Valley alluvial deposits. The resulting geospatial database supports characterization and conceptualization of the Central Valley hydrologic system between 1961 and 2003, construction of 3-dimensional hydrogeologic framework and hydrologic flow models, and visualization of analysis and model results.2009publication dateCompleteNone planned-122.429470-118.77882340.39017635.021853ISO 19115 Topic CategoryinlandWatersgeoscientificinformationAmerican Geological Institute Glossary of Geology (http://glossary.agiweb.org/dbtw-wpd/glossary/search.aspx)hydrologyhydrogeologymodelgroundwaterhydraulic headwater levelnoneCentral Valley Hydrologic ModelFlow Model CVHMTexture ModelCV-RASAGroundwater Availability of the Central Valley AquiferCentral Valley AquiferU.S. Board of Geographic Names (BGN) and Geographic Names Information System (GNIS)CaliforniaCentral ValleyTrinity CountyShasta CountyTehama CountyHumboldt CountyButte CountyMendocino CountyGlenn CountyYuba CountyLake CountyNevada CountyColusa CountySutter CountyPlacer CountyEl Dorado CountyYolo CountySonoma CountyNapa CountySacramento CountyAmador CountySolano CountyCalaveras CountyTuolumne CountySan Joaquin CountyContra Costa CountyStanislaus CountyAlameda CountyMariposa CountyMadera CountyMerced CountyFresno CountySanta Clara CountySan Benito CountyMonterey CountyTulare CountyKings CountyKern CountySan Luis Obispo CountySanta Barbara CountyVentura CountySacramento ValleySan Joaquin ValleyCentral Valley, CaliforniaNone
Data have been checked to ensure the accuracy of the data. If any errors are detected, please notify the originating office. The U.S. Geological Survey strongly recommends that careful attention be paid to the metadata file associated with these data. The U.S. Geological Survey shall not be held liable for improper or incorrect use of the data described and (or) contained herein.
Acknowledgement of the U.S. Geological Survey would be appreciated in products derived from these data.
Any use of trade, product, or firm names is for descriptive purposes only and does not imply endorsement by the U.S. Government. Although this Federal Geographic Data Committee-compliant metadata file is intended to document the dataset in nonproprietary form, as well as in ArcGIS format, this metadata file may include some ArcGIS-specific terminology.
Claudia C. FauntU.S. Geological SurveyHydrologistmailing and physical address4165 Spruance Road, Suite 200San DiegoCA92101USA(619) 225-6142(619) 225-6101ccfaunt@usgs.govhttp://water.usgs.gov/GIS/browse/pp1766_HOBS.pngIlllustration of data setpngSpatial datasets supporting the Central Valley Groundwater Availability project were developed primarily by the U.S. Geological Survey's (USGS) Groundwater Resources Program. This program is conducting large-scale multidisciplinary regional studies of groundwater availability. The U.S. Bureau of Reclamation is supporting the updating of the Central Valley datasets and their documentation and release.Microsoft Windows XP Version 5.1 (Build 2600) Service Pack 3; ESRI ArcCatalog 9.3.1.3500Schmid, WolfgangHanson, R. T.Maddock, Thomas, IIILeake, S. A.2006User guide for the farm process (FMP1) for the U.S. Geological Survey's modular three-dimensional finite-difference ground-water flow model, MODFLOW-2000Techniques and Methods6-A17Sacramento, CAUSGS California Water Science Centerhttp://pubs.usgs.gov/tm/2006/tm6A17/National Water Information System2012USGS Water Data for the Nationvector digital dataReston, VAU.S. Geological Surveyhttp://waterdata.usgs.gov/nwisCalifornia Department of Water Resources2012Water Data Libraryvector digital dataSacramento, CACalifornia Department of Water Resourceshttp://www.water.ca.gov/waterdatalibrary/Attributes added by the GIS and the data-set author were checked by inspection using a GIS. In addition, attributes were checked and evaluated as part of the review process associated with the publication of the source report.Logical consistency checks were conducted during preparation of the map by visual examination of the positions of plotted symbols on the base map (searching for spurious locations) and cross-checking the tabular locations against their graphical representation.The point features in this dataset represent the head observations in the Central Valley Hydrologic Model. The dataset is complete and is not anticipated to change.Horizontal positional accuracy of point features in the dataset was tested by visually comparing to digital maps in the region by using a GIS system.Faunt, C. C.2009Groundwater Availability of the Central Valley Aquifer, CaliforniadocumentU.S. Geological Survey Professional Paper2009-1766Reston, VirginiaU.S. Geological Surveyhttp://pubs.usgs.gov/pp/1766/PP_1766.pdfFaunt, C.C.2009Groundwater Availability of the Central Valley Aquifer, CaliforniaU.S. Geological Survey Professional Paper2009-1766Reston, VirginiaU.S. Geological Survey500000online2009publication dateFaunt and others (2009)well locations for hydraulic-head observationsFrom the available well records in the USGS National Water Information System (NWIS) and California Department of Water Resources databases, a subset of comparison wells (206) was selected on the basis of perforation depths, completeness of record, climatic intervals, and locations throughout the Central Valley. Wells are identified and numbered according to their location in the rectangular system for the subdivision of public lands and this ID was taken from the respective database.2009Faunt, C.C.USGSHydrologistmailing and physical address4165 Spruance Road, Suite 200San DiegoCA92101USA(619) 225-6142ccfaunt@usgs.govCentral Valley, comprised of the Sacramento Valley on the north and the San Joaquin Valley on the south, located in the state of California.VectorEntity point206Albers Conical Equal Area29.50000045.500000-120.00000023.0000000.0000000.000000coordinate pair16091609metersNorth American Datum of 1983Geodetic Reference System 806378137.000000298.257222Head Observationswell locations, perforated intervals, and time series of water levelsdataset originatorFIDInternal feature number.ESRISequential unique whole numbers that are automatically generated.ShapeFeature geometry.ESRICoordinates defining the features.OBJECTIDInternal feature number.ESRI143218WELLIDIdentification number of wellsdataset originator13-character alphanumeric code based on Public Land Survey System location.U.S. Geological SurveyAsk USGS -- Water Webserver Teammailing address445 National CenterRestonVA20192USA1-888-275-8747 (1-888-ASK-USGS)http://water.usgs.gov/user_feedback_form.html
Downloadable Data
Digital geospatial datasets for the textural model and numerical model of the hydrogeologic landscape and groundwater flow in California's Central Valley.
Although these data have been used by the U.S. Geological Survey, U.S. Department of the Interior, no warranty expressed or implied is made by the U.S. Geological Survey as to the accuracy of the data. The act of distribution shall not constitute any such warranty, and no responsibility is assumed by the U.S. Geological Survey in the use of these data, software, or related materials.
The use of firm, trade, or brand names in this report is for identification purposes only and does not constitute endorsement by the U.S. Geological Survey. The names mentioned in this document may be trademarks or registered trademarks of their respective trademark owners.SHPESRI Shapefile0.006http://water.usgs.gov/GIS/dsdl/pp1766_hobs.zipNone. This dataset is provided by the USGS as a public service.201120120824U.S. Geological SurveyAsk USGS -- Water Webserver Teammailing address445 National CenterRestonVA20192USA1-888-275-8747 (1-888-ASK-USGS)http://answers.usgs.gov/cgi-bin/gsanswers?pemail=h2oteam&subject=GIS+Datase+pp1766_hobsFGDC Content Standards for Digital Geospatial MetadataFGDC-STD-001-1998